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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a4994b9445abfb7c59f00a39a4e706465462ad3529a45650795b566d9fc3663' 
  AND token = 's4ofiqr/q4cqVCcilZzyk7I609rUiDNR3VyfznZA054=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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