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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f87082a5907e6134d83d8cb403cc679b739d4fdaeac7029154d3739af6e68d51' 
  AND token = '1HfYQyp+xZUwqRqmeXm9n6H3e1UsWmlrt8hd7rUJ1nI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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