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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f500a3cce3574fd8a5f8588155cd34198629bafce32bb347ed91de4894b99cc' 
  AND token = 'xJiJKrNScBE99iuAjORT22Mt5v9M8+ohM1eps8+2p/w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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