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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31539c03ebc5f0db244b142b82de0dcd2d06630257d304e532f232e7a8ffa62a' 
  AND token = 'jkEHM4EcfoviZwsSs5d5JK97Gc4baVvWuGWEtIW8iCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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