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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '631553c8972a557a075a43666045adbb769350f4bffbb85a475f3c6cd10b4878' 
  AND token = 'erjMo66vx9v2tve8Ld/0mw6S0XpzLXD81QGAoLJMSJY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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