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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0823864c12f6e0bb0b56b9dffa02d4c0297a7daaf3e1d7596edc5d9c92900b34' 
  AND token = '5tYHVaP+J4CYhbsmlpfbaTXRNgBfpzXu8su3aIE8ibM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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