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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7abeb8c715ddb54bbfa1fd3691ac278990a2455842ef6ff6d07bfbf67235a5d7' 
  AND token = 'C0c0g9EID8CtSCDLKM0jX8SoUB6M73g0zQfLeZYld8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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