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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3703774b977898a918aa805614c5c3468fe01d62121ab970e27989827a55e18b' 
  AND token = 'qv513SbzQEYE2Sr4oxdELesjmzD8Z1hZhrOG9Qsxh+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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