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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae7ed59c2e7fde892e4dfba69390386d201451db8fde6a5ae1cab76b798ef22b' 
  AND token = 'jzICTMic8owf/zSaQ06p2kwvDkhIaroc1rcrd8RVQ3U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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