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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a9677d3fae8481e89af2fa956bc035fc8e9496a7cf032229316ec74cd063b2d' 
  AND token = 'CiDuYb45Fgbbh53FYdfXwHvQ56r3MHpZtfitm7sjcMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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