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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f54761f3bfcd7c5392313fd92816a3a3f4128494d880066f96a5f9c2c00bf96' 
  AND token = 'zBjUIUo11AFiegDltwzMgO0Qq15A6Nvne46FrfTzeAg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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