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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59fa8a666d9d1ee02b4688030404757febbe6980ded76c51aa22f93fe3911909' 
  AND token = '23anX13P/WOR0RdUBprwXw9m6JeEe/W+jWrrxtTi5BY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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