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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7dfabe9c91e5a092299b746dd5fd4528d5f264a99dbff26a7fe819786ef11ac6' 
  AND token = 'yDSdMYhe3nGwAllJ2KGnxw2pr9bnzjpueaKpl8sUsRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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