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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb22d046411ea1f466f62cfd2feea6951e839e9b9904f9540bfd5923a0a7b370' 
  AND token = 'TZxZsnSkD8/IgpscK1Pm+YSDIgkwh2ZAZmtI4sp1+Sc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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