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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '086eff5ffb1c49e6c06729bac4551112e28e81a7b4c5016bea2657f0c8171670' 
  AND token = 'SuaXOzf9X5+aeK07Wb8K+fuXSYcTYO34cKIwbUUR59Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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