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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a6fec638a8ea765c7af7b4201365ac98c514aede1f42dea1f1683eb7c3d9a52' 
  AND token = 'sXc3CGcD8MyQu9s0d1luLuKcL2wdUt7ahyIQkb0UpmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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