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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ba3480ffd437cd6a6f3dadec9300b5c0b986a825df8fede551ec6f673327555' 
  AND token = 'IcBT8W/Hq6cjuFC5U2KYjkOLxBgcjQsN2HtGtX9wV0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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