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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6a92afd6ffb2291c31153722b533f2c14625fa8e99cf14244a380e52480bd28' 
  AND token = 'xv465/cygXbQZ6OVtEEjbHVwQOd338raL2H3WTNB26M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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