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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4b935b21216cb4888270d4553800621bcb65ab4b54654f1506176e5e638afca' 
  AND token = 'IbmcDAH1HlWGg+jyD7o3isBPctqu+TqrxoprA/Do8dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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