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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a382a2fd3cbe4b64ecf09798f00434636131e2dbd9c8c003b39bde1ce42d509' 
  AND token = 'GWERQXBC12+QzUxEGNwFuPLept/l1Yl9oHzxAmAvQv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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