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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e53731233f485baf76a97c77c2c3a83d9e1c5e5c6c54bb5f0e8d57131e898f6b' 
  AND token = 'D7+0FQUetv33oMSvrbDljswFr0pV4qSTl5wUR45/bOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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