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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91972b0bddf0a72e7d8b2c0d7412fd4fe72e2e03b5ba8bacea976ce25cab69c4' 
  AND token = 'TRJ6Zmtxk5gVByGcpiV1y1I4SMYK1mqo6I5ueGJRnDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00097

JSON explain

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