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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbac75107bbf0325fe47ec31e31609eeed3527e7a96398552e56fdf92df028b3' 
  AND token = 'kZbUol9W/bzdbOzTKx2XCLSquLnbkYxD0ZTFzAqL2DM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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