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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd785aaa600e398f3b2e6affd2010916b12ca5ef609884902281a701e4831776b' 
  AND token = 'C+Hc2sE1NVe1KD0AL3eT6DXGJ+1StY6AozjKrD47WP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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