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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23e37ccc16450a590ce3f6e820811b6985d7cd1f9929f2f3b4c1e69edd521d2a' 
  AND token = 'iUqFeWzLYoyqbBp7412Hb1pdoL1rNRePQbuVVFsZEMg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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