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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7935afd551b341588ef80c77388ace2a088f0159177eb3a5e53a196425e12241' 
  AND token = 'bHXOeUNtTxmn0CHuSe5iz2GHNpWqF+Ao+PUifPNCegE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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