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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '205490bdbdc9ca34b9011a68db2cc4721371ebce412418cbd177d361c202de4d' 
  AND token = 'aUbZVoQ9fSpZ4HLEiKaoVHXYGgpF4KV7QkUQLWmV6SA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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