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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5c9facc43a0248d861c1e744a62c21c5383c80f64743cda5330cdf689c88ba6' 
  AND token = 'VJOVAAQPXBx59QenCnOP9WMDAXiQ0tufx0SKfhY8MCg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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