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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '923cc93ee1785b335267d077840e68bf3b08f27ecaa43edbd1b58afb0255feee' 
  AND token = '8s7mvlz7/2uN/n/pLA+It/enrdkAn11Zs+13eUNJJQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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