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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40c670942a699c2505fb51510350d1c9e4e59c3aa164a4f385ccec85a479e3d2' 
  AND token = 'AZHacE5yFX+RGOnOxfcM0zcLuhedKOviqN0UVavJBNc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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