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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec5f32f26834bf35ab3db04a6bed0d0e856df1aded837df0c6267298ba3eb94a' 
  AND token = 'ERtfe1u39s4nkSs6VG+wOxZlbZhs2u8gPQsiI8/esII=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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