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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2de90902b8fcc2c155cf12ea351a8693158e56c7f5c0e05392251ed302df542' 
  AND token = '51MgM0kCs4K1lOKVr4CDgqLSUuUQXTpevriEA+ge6Y8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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