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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af91d2e93e416206dbc133eb0ed398bcce061e02fe9dded9cd2770fee2313f67' 
  AND token = '3i4XElQyD7e41t29i7Fh3NEmHBbzmrHd+iWjlMdx+rc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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