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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a57db1fa85a97169be610c58c6e945c89958dee043a8861474fa71a6c72cda0a' 
  AND token = 'z2tqnUXYJAd9MX2b1iTWMoAFc6dreHH7ZSf//d8vDVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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