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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ec4eb1f165a1032f35c32caca001602692884787fa07c62ff8babf55b15e186' 
  AND token = 'VDX6LfZhXqyNIq8IlECLu27LbLTFDDS+gQeI69IYih8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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