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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c473be700d121b94c1e3df563faa9830204f1a64fc98f1ae5accd32f36aca02' 
  AND token = '/7lkQ/rBAF9hby+ZokKLyUm86kcfRIRr/blsA0SGLWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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