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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5d7d41812bda6af793a55f1c1bd0601f5438c726dd44ff02b17212907adb960' 
  AND token = 'Cdht0MMvZQFP6y9CjPQVE3O//caU7RLbp+LqNif14Is=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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