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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9aa18cbb5ad66834938cfcbc5bf22955a995e4772d3c9a66ab3386fbed6fa83d' 
  AND token = 'K794g6UZOBjdSmtONm7lPI/1kAZc176i1mk27LGySa0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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