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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69a8de5eb17d11fca24296db0665fc7e88c1e3c416ca3c6bc064058d13805ba2' 
  AND token = 'OV9BVgH02ePoQebO6JmUsf2u+Q9Mev/KX7A/HBLoV58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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