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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8575bd133c92bc02085cf7cd714183e971e85201f14e62e7ecf039880f5cecdc' 
  AND token = 'O0N0xHBkLCpdvbzRZM5X/WofPRU2Y1k/A6Mculzy3ks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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