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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '632c5299926f7cc170afe30882bab8bb44d24b180a3c5d7e814e608492b6ea94' 
  AND token = '3kJCqznMJxQ63eFHIBSAzHOxP45s4iNCG3WRHvWMJAQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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