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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '732df0050803306e4cfc62cc5b315ae8da65599667194e13fd3cf554c9da7d49' 
  AND token = '7HWqZ3MDCXRLh1+ILEutuR4jy6qHWHYm5srAyEoCvl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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