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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d1990e95f1df23d89d5ae5486e2e8be1a136e460c3b1205106cb9ceda936dff' 
  AND token = 'fV3BED5hZe0RPUFkB96bw4XOxdFZPF9Fl4jnnzWbRSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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