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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b55b32a5af665cf9d02df628a64071e4a0737e7ab7ed421491edb3d7858cfb6' 
  AND token = 'aF3X+/yPA3r3qCls3Nd8pHfxYIzq4EBkqoSLqn+Kcp4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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