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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb2233edf2d5932b6b40bf879aaff3ed44f1acf92722410fefcba2bfb61cb22e' 
  AND token = 'H6durII4vP3TMTsclBo9zY7NKly9HlweV/2HgN5k6+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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