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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd28c6fe5acd0917ff9c89842ec44c1fd8d274d104d4dee250e18419f10a706d9' 
  AND token = 'ArovNx+qZZ9/weCGFbBh294gt2LOGQIY+FiaOPS/HFM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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