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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73162b53f4956313c7c21644b74748670ede723668d33f6063a4f046d6f3726d' 
  AND token = 'lJbTKnG28A708kWucjyuuBu4W2IAMua4Goarrqp1RFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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