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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac93e119ab22269aa7ddb7fb21fca7b2f36dc98b0efe07103dfdeb0d9f060b97' 
  AND token = 'rF6ixG5YNjSqGKWndPgna82972UwNdU+brRj2L9lRP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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