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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df8f6218a1987e445c3e9bfb73bae244c4c7b738ad9b8f57d6f8533c34a722e5' 
  AND token = 'ZxqYSOgkQ55txQ0inUN1YjIkhAbHBumxYton18hhCwI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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