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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '600dcd882af21b0e175d255dafb8b42574a992f34e51e0b9c69e87fdbbff70bf' 
  AND token = 'm/Ra86wxAlAGMFJd0UIFRy+LqNIa1tk1Dg0yGdYI9jU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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