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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd92aae0125322fe350f7cf23141f67d837af4374b48943cf029864951d505ee0' 
  AND token = '3sej5x3/LNrwQ0fn+9rYlw6AVAxaYVDRTwQQaUAmBd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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