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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a6d71fc194ec6a0577946c8c5ddab55ed0e5c1bb35bb9a823eb699971beb6dc' 
  AND token = '0eOyO9VmVZnp6SircCwHPBL0Iw7N/gf1wfp67UX5o18=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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