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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '72630f6464d3bc0b261f7343b00e8afb4949a965cdfd51abbd0ada7d201a4c4b' 
  AND token = 'aR6Pdmep8GB/1QYWy38kwQD+M4kIM9Nn2rCyzQ7gXZc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00329

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}