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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '165c286e2cf98b09b7f9f0e03b33826702b7992d74dc4fac8935c0c5c55ee47a' 
  AND token = 'XzAqjtEUW5/KKE9t7dtuZfUGH3lM0HB2mjDof4rwm80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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