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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7c60b2287580be89175cae7570103c4b07a82ebd331e8fdfa047fae01126dcc' 
  AND token = '+zPymdYnzqBYFDzf7lwiqq/wIkAUzOgzUEvTSMduHfE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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