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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a03fc75224b199b66e7041b1f86da4359865036d75120cea1f9d44027336630c' 
  AND token = 'OlS2769dH7/oLmrYUAYRXJve/9s3My5SHxwNwEQl/xI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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