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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9731d39aae380860ca4105d02cf4cbf490502100be2834351a6bb481e205a0c' 
  AND token = 'J+q89dowUKK3nzHLo3WSdOajtZhZS5TQdqyy3LNE/WE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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