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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc64e0d62afd4c565111d1bb7a77bef2699cbad3e729b834940fbb985b7fd127' 
  AND token = 'TiZ26dba2A/gwOYcotbLdVy7v8j8CxV5PhETN0LAA5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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