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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbb4f6c68896b0dd06f3a660676bf8de27eebda99c9b6a0d8ebf8e045c5154f7' 
  AND token = 'DjMqD0wfp5PSHBeN2qROVzDr0KXq26HT9eVJ4udRhIQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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