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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '436b1d17e19be6459f526a0f829fa0228f356153b8ea23607beb084afce770e1' 
  AND token = '62941RF1hhAKLAWOyO0yPrfPga53sUx1R/4KYwgsNkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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