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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58fc0178250909f0614fc24c50c0beecbb52dd3c838e24432a05afb45dbe08ef' 
  AND token = 'U6LQ3XTHiigJIJi3D463qXmxGTaoNfWfOXOatiKqUBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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