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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6041fc22b0d8618ab3118bc7f7abf9b38cfb88f0a3ed7c11ac38c3236c29e2ba' 
  AND token = 'x7+Sr14MCO3XYNmSnAW2I9+RJmvhhG3LMPUhcKrumTQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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