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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e283f416f90d867ed6c27ac4ffe75a6b91e779954a45ce02b74bd1cfa5a49347' 
  AND token = '9yYm+uWIjGJeldDrjqsg6JgIVfM27cjHA0qIc4tv0rI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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