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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81eaae51f004d997d4e8de8fa86fe4517d898a918bc47f30fdc746044ac583f9' 
  AND token = 'aWqNHCodhbaRZEJ64zPWfPjnRyHNFaln9qt5n8V9UzQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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